CVE-2017-0896 Missing authorization in Zulip Server
Authenticated users can bypass invite restrictions to add members to a Zulip organization when the admin-only setting is enabled.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2017-0896?
CVE-2017-0896 is a medium-severity missing authorization vulnerability in Zulip Server, published on 2 Jun 2017. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Zulip Server 1.5.1 and below suffer from an error in the implementation of the invite_by_admins_only setting in the Zulip group chat application server that allowed an authenticated user to invite other users to join a Zulip organization even if the organization was configured to prevent this.
Which versions are affected by CVE-2017-0896?
It affects 1 product.
Products include Zulip Zulip Server.
How do I fix CVE-2017-0896?
No fix has been published for CVE-2017-0896 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2017-0896 being exploited?
There is no known exploitation of CVE-2017-0896 in the wild and no public exploit code.
Other vulnerabilities in Zulip Server
- CVE-2019-18933 Information disclosure in n/a
- CVE-2020-15070 Code injection in n/a
- CVE-2017-0910 Missing authorization in Zulip Server
- CVE-2025-31478 Zulip Authentication Backend Configuration Bypass
- CVE-2023-33186 Cross-site scripting vulnerability in Zulip Server development branch via topic tooltip
Sources
Also known as GHSA-98x3-p3h4-w982.